What is the critical engine defined as?

What is the critical engine defined as?

• A. The engine whose failure would most adversely affect the performance and handling qualities of the aircraft.
• B. The engine located on the left side of the aircraft.
• C. The engine with the highest horsepower.
• D. The engine that starts first.

Answer: (A)

In a multi-engine airplane, the critical engine is the one whose failure would produce the greatest reduction in performance and the most challenging handling, especially regarding directional control. This definition looks at the consequences of losing an engine, not at which engine starts first, nor at which engine has more horsepower or sits on a particular side. The best answer captures this idea: the engine whose loss would most adversely affect overall performance and handling. In practice, pilots assess this based on how asymmetric thrust, yaw, and rudder authority would behave if that engine stopped; in many twins, losing the left engine tends to create the largest control challenge, but the key point is the potential impact on performance and control, not its position, power, or starting order.

In a multi-engine airplane, the critical engine is the one whose failure would produce the greatest reduction in performance and the most challenging handling, especially regarding directional control. This definition looks at the consequences of losing an engine, not at which engine starts first, nor at which engine has more horsepower or sits on a particular side. The best answer captures this idea: the engine whose loss would most adversely affect overall performance and handling. In practice, pilots assess this based on how asymmetric thrust, yaw, and rudder authority would behave if that engine stopped; in many twins, losing the left engine tends to create the largest control challenge, but the key point is the potential impact on performance and control, not its position, power, or starting order.